Is instant glue safe for use in electronics?

[Behemot]

I have many tubes of these cheap chineese Super Glue instant glues. Found them quite practical, but one question for safety - it is not conductive now, but may it become after few thousand houts of heat application?

Just glued some pieces of copper which broke away from PCB on primary transistors and since these generate lot of heat together with high voltage there…

[PCBONEZ]

Re: Is instant glue safe for use in electronics?

They aren't going to all have the same formulation and since even a trace of something can change the conductive properties it's impossible to say what will happen.
.

[Th3_uN1Qu3]

Re: Is instant glue safe for use in electronics?

I've been using it for years. Never had a problem. It's only a hindrance when you have to solder in that area... the fumes are very very nasty.

[Behemot]

Re: Is instant glue safe for use in electronics?

Yeah I noticed when something got into my eye

[dumpystig]

Re: Is instant glue safe for use in electronics?

I've been using superglue for years too. Never had any probs regarding electrical conductivity, just ensure the glue is fully dry/set before applying power. Most recently I doused the choke windings on a PSU to suppress the buzzing, worked flawlessly.

[Behemot]

Re: Is instant glue safe for use in electronics?

Well I turned it on, started MemTest and went for womething…when I got back I smellt something was burning there. Display black so I turned it off. Than I measured output, seemed fine, powered it up again with no problem…I than realized I turned the display off before I left the room lol

Probably some fumes of the burned PCB itself (used microblazer for a part of it, next time I will use high-power soldering pen only) were released from the glue when it heated up, it's running fine now…

[dumpystig]

Re: Is instant glue safe for use in electronics?

Happy daze

[PCBONEZ]

Re: Is instant glue safe for use in electronics?

Yeah, it's all good when the fire goes out quickly.
.
Just teasin'....
.

[japlytic]

Re: Is instant glue safe for use in electronics?

When reattaching a heatsink on the main LSI of a set-top box or PVR, I used PVA glue (after removing all the old glue on the LSI and heatsink), which works surprisingly well.

[larrymoencurly]

Re: Is instant glue safe for use in electronics?

When reattaching a heatsink on the main LSI of a set-top box or PVR, I used PVA glue (after removing all the old glue on the LSI and heatsink), which works surprisingly well.

What's the melting temperature of white/yellow glue? I've been using silicone rubber RTV. At least it's rated for the highest chip temperature and sticks better than thermal tape.

[Behemot]

Re: Is instant glue safe for use in electronics?

It still smells like something is burning in there lol.

I'll probably try my comuter (arround 300 W raw power - assuming from 390 W full load with original Enermax Liberty), if the PSU will survive this, I guess it's fine lol.

And, oh, I am talking bout the LC-Power I posted in Power supply built quality discussion.

[Th3_uN1Qu3]

Re: Is instant glue safe for use in electronics?

LC isn't Huntkey. It's Deer, now known as Solytech.

[Behemot]

Re: Is instant glue safe for use in electronics?

I am pretty sure LC is NOT LC-Power. LC always was making only supplies of low power, up to 550 W max. But I have seen LC-Power PSU's of up to 950 W, maybe more. They also were not so cheap so I guess this high-power models can be somehow decent. Another small things like I never seen LC painted, LC-Power PSU's are usually black etc.

It would be best to continue in the right thread I linked, but according to the PCB I am pretty much sure it IS HuntKey. Have a look in there.

[stj]

Re: Is instant glue safe for use in electronics?

you cant stick a heatsink with cyanocrylate or pva,
it's not thermally conductive.
use zinc-loaded--epoxy or some other thermal glue.

and cyanocrylate softens and then slowly turns to a gel as the temp increases.
it then vaporizes - but i see you noticed that!

[redwire]

Re: Is instant glue safe for use in electronics?

One thing missing is flammability - most adhesives burn and can make a board more of a fire hazard, if a part burns up. I'll use silicone RTV in power supplies, for the temperature and voltage rating. Cyanoacrylate I don't think you can get a gob or thick enough layer of it to light up. Hot glue is easy to gob and burns nice.

[stj]

Re: Is instant glue safe for use in electronics?

keep in mind if susperglue melts the objects seperate.
if you glued a small heatsink to something, it will fall off onto the other parts!

[momaka]

Re: Is instant glue safe for use in electronics?

keep in mind if susperglue melts the objects seperate.
if you glued a small heatsink to something, it will fall off onto the other parts!

That's what I am most afraid of.
I have several motherboards that could benefit from some heatsinks on some of their MOSFETs... but I don't know what to glue down the heatsinks with. AS thermal adhesive is $15 for 7g - too much for fixing up an old motherboard that's probably not worth even that much.

Wood glue seems like it will crack with the heat-cycles, thus causing the same problem you mentioned. I haven't tried it, though. (But I am pretty sure that is what's going to happen.)

Hot glue melts at too low of a temperature and becomes quite gooey even at under 100C.

Bathroom silicone releases acetic acid IIRC, so that's likely a no-go on heatsinks and electronics, I think.

Guerrilla Glue? Anyone try that before?

[c_hegge]

Re: Is instant glue safe for use in electronics?

^
Roof and gutter silicone is completely non-acidic, since it's meant to go on steel, and it doesn't crack or melt when it gets hot. I don't know how well it conducts heat, though.

That said, though, a tube of AS adhesive lasts me for ages. It's more like maybe $1 worth of it per chipset.

[stj]

Re: Is instant glue safe for use in electronics?

well silicone comes in acid,alkali and neutral versions.

but what have you go in mind?
most of the heatsinks you see on mobo fet are for looks.
the resin package is a thermal insulator - your heatsink would need to go onto the tab.
and obviously you cant go and short all the tabs together.

if you look where the fets are soldered, you will see a shitload of copper via's to the back of the board,
and these go into big tracks.

this is a form of heatsink embedding - you could fix your heatsinks onto the copper behind the via's if your case will let you.

[PeteS in CA]

Re: Is instant glue safe for use in electronics?

Cyanoacrylate glue can be used in mil-spec products to repair lifted pads and traces on PC boards. Rubber-based potting compounds (for high voltage insulation) have "sand" added if heat conduction is important.